Stop the Weed Eater and disconnect the power cord from the outlet, if necessary. Wait a few minutes for the engine and other moving parts to cool down.
Remove and set aside the wing nut attaching the shield above the trimmer head in place. Pull the plastic shield off and place it with the wing nut.
Pull firmly on the tap button to remove the line spool from the base of the trimmer. Set the spool aside or discard if it is empty.
Tighten the adjustable wrench on the dust cap above the trimmer head and unscrew the head by hand, turning it several rotations counter clockwise. Place the head with the other parts.
Lift the rubber boot over the spark plug at the engine end of the trimmer (gasoline models only) and unscrew the spark plug, if necessary.
Flip down the cover protecting the air filter behind the starter cord and pull out the air filter from the engine assembly, if necessary. The Weed Eater is now disassembled.